davinci: fix implicit declaration of function 'davinci_errata_workarounds'

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
diff --git a/board/davinci/common/psc.h b/board/davinci/common/psc.h
index b18a185..b2dd7b5 100644
--- a/board/davinci/common/psc.h
+++ b/board/davinci/common/psc.h
@@ -27,5 +27,6 @@
 void davinci_enable_uart0(void);
 void davinci_enable_emac(void);
 void davinci_enable_i2c(void);
+void davinci_errata_workarounds(void);
 
 #endif /* __PSC_H */